Fan



Dec. 17, 1929. L. o. MONROE 1,739,604

I I FAN Filed Feb. 14, 1927 2 Sheets-Sheet l 4 11v VENTOR Laws 0. Monroe A TTORNL y 'i Dec. 17, 1929. L. o. MONROE 1,739,504

- FAN Filed Feb. 14, 1927 2 Sheets-Sheet 2 INVENTOR Laws 0. Monroe BY fldi A TTORNE if Patented Dec. 17, 192 9 UNITED STATES LEWIS o. MONROE, or KALAMAZOO, MIcirr'GAm,.. 'ssIenon- :ro cruiser. JEAN 7 COMPANY, or KALAMAZOQ,.MICHIGAN I rim Application filed February 14, 1927; serial mascara.

This invention relates particularly to fans for delivering powdered fuel or other similar or' abrasive material.

The objects of the invention are:

First, to provide a fan structure of large capacity permitting free passage of the abrasive material, in which the fan blades are detachable and renewable.

Second, to provide in such a structure a formation and disposition of fan blade which protects its fastenings and thereby insuresv durability. Third, to provide improved protection means for such fastening.

15 of my invention will definitely appear from the detailed description to follow. The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing forming a part of this application, in which:

Fig. l is a detail side elevation of the fan 5 and its volutes constituting my invention taken from the intake side, the intake side wall of the fan being removed.

Fig. 2 is a detail sectional elevation taken on line 2-2 of Fig. 1.

Fig. 3- is an enlarged detail elevation of the fan wheel or rotor itself removed from its shaft from the blade side.

Fig. 4 is av detail sectional elevation of the fan wheel or rotor taken on line 4&4 of Fig. 3.

Fig. 5 is an enlarged detail sectional view taken on line 55 of Figs. 3 and 4, showing details of the fan blade structure and the method of protecting its fastenings The parts will be identified by their numerals of reference which are the same in all views. 1 v

1 is the fan volute. '2 is the fan wheel made up of a central conical shaped casting 22 7 and a circular disk 21, preferably of halfinch steel plate, to which thecentral tapered hub casting 22 is secured by means of rivets 23 at its outer edge and by cap screw 24 near 7 circular plate is secured, fan blades with obthe center. The hub is suitably keyed or .otherwise secured to the driving shaft 3.

Objects pertaining todetails and economies fan blades 4 Litre flanged with :an Z

oblique flange 41 :and secured to !the .p'late 21 by countersunk screw bolts 9 withrtheiusual lock =ntit-lWiCBSt The fan blades 44: are obf 'liquely disposedcand' their inner ends made, "considerably widertlianztheir peripheriesand protected by a earned flange portion -42, shown particularly in detail in Fig. '5 g ithiszarrangement it will be seen that the deliwery of powdered coal or other'aibra- 0 sivematerial is very efiective without undue wear upon the flange. Thefan revolves as indicated by the arrow.v The lblade of the fan is pnesent ed edgewise at the i-fl'ang. The

powdered fuel is sucked in at the intake :11 =55 I between the disk and the volute wall.

By this means it is possible to run a fan indefinitely by simply renewing. the blades as they become worn. Due to their formation :30 they are readily produced and afford protection for the connection. Only the blades need to be renewed, the connecting bolts being preserved for a comparatively long period. Z 85' The formation of the blades distributes the material in such manner that there is little or no Wear on the plate or the connecting bolts Patent is:

1. The combination of a volute with intake m5 7 at the side,,a fan comprising a flat circular plate with a conical hub block therefor,'to the flat side of which conical hub block the lique flanges suitably secured theretoby coun- I00 Y 'nm e l v central part and with forwardly projecting tersunk connecting bolts, the inner ends of the said fan blades being broad at the cen- V tral' part 7 and with forwardly projecting flanges protecting the said connections, a flanged bar on the back of the disk to cause circulation for protecting the nuts, as ,speciv 'fied.- i i 2. The combination of a volute intake at the side, a fan comprising a flat circular plate With a conical hub block therefor,

to'the flat side of'wliich conical hub block the circular plat is secured, fan blades with oblique flanges, suitably secured thereto. by

countersunk connecting bolts, the inner ends of the said'fan. blades being broad at the specified, r r

3;. The combination of a volute with inflanges protecting the said connections as take at the side, a fan comprising a fiat circularplate yvith'a hub therefor, fan blades with obliqtiefianges suitably secured to said 'plate by countersunk connecting bolts, the

V inner ends of the said fan bladesbeing broad at the central part protecting the said connections, and a flanged bar on the back of the disk to cause circulation for protecting the nuts, as specified. v

' 1 In itness whereof I have hereunto set hand. a LEWIS O. MONROE. 

